By Paul Dyson

In keeping with actual international difficulties and structures, this booklet takes a pragmatic method of architectural recommendations, giving step by step recommendation on the right way to layout excessive functionality, controllable and versatile structures.

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Extra info for Architecting Enterprise Solutions: Patterns for High-Capability Internet-based Systems

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The main problem here is unpredictability. There is no guarantee that even one customer will turn up to use the system, but you have to figure out what will happen in the worst case scenario (or the likely worst case). You will not have every Internet user in the world accessing your system at the same time (or even over several years), but if you are a global company, a major sales promotion may cause huge peaks of demand and 32 Chapter 3: Internet Technology Systems Chapter 3: Internet Technology Systems 33 associated large spikes in usage.

A firewall will commonly consist of filtering routers and a firewall host (sometimes now embedded as an extra ‘blade’ in a hardware router). Common firewall products include Firewall-1, Gauntlet, and SonicWall. 30 Chapter 3: Internet Technology Systems Chapter 3: Internet Technology Systems 31 Load Balancer A load balancer is a type of router that balances network requests between a set of servers. All traffic for the set of servers goes to the load balancer and the load balancer determines which particular server should service any new connection.

Both want a system that can be made available in many different countries and in many different languages – this is a global corporation, after all. And both want a non-trivial set of functionality to be accessible by a large number of users, which necessitates a significant investment in the hardware and software infrastructure, and in the development of the application. A meeting of the GlobalTech board decides that the two projects should have their budgets and objectives combined. A single project will build a single system that meets the requirements of both the customer support and sales departments, as well as integrating (or replacing) the current online catalogue run by the marketing department.

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